Belt attachment



FIG. 1 is a front and left side perspective view of our design for a belt attachment;

FIG. 2 is a rear, bottom and right side perspective view thereof;

FIG. 3 is a front view thereof;

FIG. 4 is a rear view thereof; and,

FIG. 5 is a right side view thereof, with the left side view being a mirror image thereof.

The broken line showing of elements is included for the purpose of illustrating environmental matter and forms no part of the claimed design. 

CLAIM The ornamental design for a belt attachment, as shown and described. 